Biology Reference
In-Depth Information
169
170
169
Narrow green pine aphid (
Eulachnus brevipilosus
).
170
Eggs of rose root aphid (
Maculolachnus submacula
) on
stem of
Rosa
.
171
attacked. The aphids (1.7-2.2 mm long) are mainly
green, with a whitish bloom, and distinguished from
Eulachnus agilis
by the inconspicuous dorsal platelets,
the darker appendages and the short setae on the third
antennal segment.
Eulachnus rileyi
(Williams)
syn.
Protolachnus bluncki
Börner
Narrow brown pine aphid
This widely distributed species feeds mainly on
Austrian pine (
Pinus nigra
var.
nigra
), and is
recognized by its brownish to orange-red body colour
and associated waxy bloom.
171
Protective earthen canopy around colony of rose root
aphid (
Maculolachnus submacula
).
Lachnus longirostris
(Börner)
A relatively uncommon species on oak (
Quercus
);
sometimes noted on ornamentals but rarely if ever
troublesome. The aphids are similar in appearance and
habits to the following species but are larger
(4.5-6.4 mm long) and have inconspicuous siphunculi.
Maculolachnus submacula
(Walker) (
170-171
)
syn.
Lachnus rosae
Cholodkovsky
Rose root aphid
An often common pest of rose (
Rosa
), particularly in
England, Germany and the Netherlands; also present in
North America.
Lachnus roboris
(Linnaeus)
This locally common species is associated with oak
(
Quercus
), including holm oak (
Q. ilex
), colonies
developing on the shoots and smaller branches during
the summer months; infestations sometimes attract
attention and cause minor damage to garden and
amenity trees. The aphids (3.2-3.5 mm long) are shiny
black to dark brown, with very long, yellowish-brown
legs, and the siphunculi borne on large, blackish, hairy
cones; the wings of alates are clouded by brown
patches. Colonies are typically ant-attended, and often
very large; however, the individual aphids tend to
remain relatively well separated and do not cluster
tightly together.
DESCRIPTION
Apterous female:
2.7-3.8 mm long; yellowish brown
to dark chestnut-brown or blackish brown; antennae
short and blackish brown; legs blackish brown;
abdomen with dorsal hairs arising from small plates;
rostrum short; siphunculi short and conical; cauda
rounded and inconspicuous.
Egg:
1 mm long; elongate-
oval, black and shiny.
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